There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
They say that black is beautiful, but these people can also add the word wealthy to. that. Here is a list of the top 10 richest black people in the world for 2013. Robert L. Johnson is the founder, former Chairman and ex-Chief Executive Officer. of Black Entertainment Television, or BET. He is considered as the first African. American to become a millionaire after becoming the first black person from. anywhere in the world to become part of Forbes Magazineâs list of the richest people. on earth.